I need calculate the difference between two dates. But i have some rules: I can include in my calculation only the minutes that i work per day, that would be 480 minutes. The minutes remaning (before and after) in the business day, and of course weekends and holidays i have to eliminate. I already check a lot of solutions as: "how to eliminate weekends and holidays ?" or "how to calculate business days ?", it was good, but i could not solve my problem 100%. My date field format is: dd/mm/yyyy hh:mm:ss. Here is my package workbook and excel file attached.